Type-writing machine.



C. H. BBQWN. TYPE WRITING MACHINE. APPIJCATION FILED MAR. 6, I913.

' Patented Apli 2?, 1915.

/ INVENTOR:

WITNESSES:

Y E, W 0 6 T g m, Y. B, G U H 111N111; TATE CLARENCE H. BROWN, 0)? BRIDGEPGRT, CONNECTICUT, ASSIGNOR TO UNDERWOOID TYPEWBITER COMEANY, OF NEW YORK, 11111, A CORPORATION 015' DELAWARE.

TYPE-'WRITING MACHINE.

To all whom it may concern:

lie it known that I, CLARENCE H. BROWN, a citizen of the United States, residing in Bridgeport, in the county of Fairfield and State of (.onnecticut, have invented certain new and useful improvements in Type- Writing Machines, of which the following is a specification.

My invention relates to typewriting machines, and is particularly directed to relieving the machine of some of the shock to which it is ordinarily subjected in linespacing operations.

Another object is to provide means for adjusting such line space mechanism; and to provide means for rendering the operation of such mechanism more accurate. To bring about these results, a spring is interposed between the platen and the usual ratchet. wheel by which the platen is rotated. There preferably are two such springs symmetrically arranged, which normally hold the platen in. a given position by keeping an arm fast on said platen against an abutment fast on the line-spacing wheel. Said abutment is preferably adjustable and by such adjustment the tension of the springs and the alinement of the line-space wheel with the platen may be altered. hen said alinement is so altered, it brings the wear on the platen in a new place, and thus said adjustment furnishes means for distributing the wear on a platen uniformly over its surface. The mechanism also may comprise a stop which coperates 'with the driving pawl of the line-space mechanism, in such a way that it is impossible for said pawl to overthrow the linespace wheel, and if the usual detent for holding the line-space wheel in position is used, the mechanism becomes positive in operation.

Other features and advantages will hereinafter appear.

In the accompanying drawings, Figure 1 is a perspective view of so much of the shiftable platen frame of an Underwood typewriting machine as is necessary to understand my invention as applied there to. Fig. 2 is an end view of the same. Fig. 8 is" an end view showing the parts during a stroke of the line-space lever. Fig. 1 shows the parts at the end of a stroke. Fig. 5 is a section. showing some of theparts seen in Fig. 1. Fig. 6 is a perspective view of the adjustable abutment- In the Underwood typewriting machine,

types 1 strike against the front of a platen 2, which platen is rotatably mounted in a shiftable frame 3 by means of an axle 4 journaled in said frame. Said axle has journaled thereon a. line-space wheel 5 which is arranged to be engaged by a pawl 6, said pawl carried on a slide 7 and operated by an arm 8 of a lever 9, in the usual manner. Said. pawl is normally drawn forward by means of a spring 10 to the position seen in Fig. 1, from which position, when. the lever 9 is operated, said pawl will be driven backwardly and turn the line-space wheel 5 through a number of spaces determined by a slide 11. Said line-space wheel has fast thereon a stop 12 against which bears one arm 18 of a bell crank 11 pivoted at 15 on an arm 16 fast to the axle 4: of the platen,

said bell crank arm. 13 being drawn against crank arm 13, and by means of the spring l7, draws the platen axle around with it. Preferably there are two stops 12, each hearing against similar arms 13 on bell cranks which are symmetrically arranged around the platen.

It will be seen that if the line-space lever 9 is violently operated, the pawl 6 in turning the line-space wheel 5 will tend to make the stops 12 revolve the bellcranks 14 around the pivots 15, thus drawing on the springs 17, and that said springs may be of such tension that they will only start the platen slowly. Said springs are limited in turning the line-space wheel 5 around the axle by means of an abutment 19 which is shown in the form of a screw20 having an eccentrically mounted head 21 thereon. Said screw fits tightly in a threaded socket in-the line space wheel 5, so that it will remain in any position in which it is set, and therefore adj ustably hold the adjacent arm 16 at any required angle to the line-space wheel 5 within the limits of the eccentricity of its head 21.

The action of the parts may be summed up as follows, so far: The pawl 6 starts to revolve the line-space. wheel so that it stretches the springs 17 and tends to carry. the abutment 19 clear of the adjacent arm 16. The springs 17, however,.immediately cegin to revolve the platen, and bring it up with the line-space wheel so that the said adjacent arm 16 bears against the abutment 19.- The line space wheel 5 has bearing against it the usual spring pressed detent 22 which serves to bring said linespace wheel to rest at the proper point, and the pawl 6 has thereon 'an extension 23, which at the limit of its throw'rides under a projection 24; of the shiftable frame 3, thus locking the pawl 6 against the line space wheel -5 and preventing the linespace wheel from being overthrown. This arrest of the line-space wheel positively arrests the platen by means of the abutment 19, for if the springs 17 are properly proportioned they will bring the platen up with the line-space wheel before the operator can'release the line-space lever 9.

The abutment 19, it will be noted, may be utilized for varying the tension of the Springs 17. Thus, as seen in Fig. 4, where the head of said abutment has been rotated to bringits axis of greatest eccentricity against the arm 16, the springs 17 are greatly stretched, While in Fig. 2, where the other'axis of the abutment is adjacent the arm 16, the springs 17 are comparatively slack. This adjustment also alters the alinement of the teeth of the wheel 5 with the platen, and thus alters the point at which the type strike the platen, so that by adjusting the abutment 19, the point of Wear on the platen may be altered.

Variations may be resorted to within the scope of the invention, and portions of the improvements may be used without others.

.'Having thus described my invention, I claim: 1. In a typewriting machine, the combinatipa with a revoluble platen and a line space'whecl loose on the axle thereof, of an arm fast on said axle, a lever pivoted on said arm, a stop on said wheel bearing against said lever, and a' spring connecting said lever and said arm.

In a type-writing machine, the com- 1 bination With'a revoluble platen and a line spac wheel loose on the axle thereof, of an arm on said axle, a lever pivoted on said arm, a stop on said wheel bearing against said lev er, an abutment on said wheel against which said arm bears. and a spring connecting said lever and said arm.

' In'a" typewriting machine, the combination with a revoluble platen and a line space wheel loose on the axle thereof, of an arm fast on said axle, a lever pivoted on said arm, a stop on said wheel bearing against said lever, a spring connecting said leverand said arnn-and an adjustable abutment on said wheel against which said arm bears, whereby the tension of said spring may be varie In a typewriting machine, the combination with a revoluble platen and a line space wheel loose on the axle thereof, of arms extending radially from said axle, oppositely extending levers pivoted on said arms, stops on said wheel bearing, against said levers, springs connecting .said arms and levers, and a abutment on said wheel bearing againsto e of said arms.

5. In a typewriting machine, the combination with a revoluble platen and a. line space wheel loose on the axle thereof, of a pawl for driving said line space wheel, arms extending radially from said axle, oppositely extending levers pivoted on said arms, stops on said wheel bearing against said levers, springs connecting said arms and levers, an overthrow stop limiting thethrow of said line-space wheel, and an abutment on said wheel bearing against one of said arms.

6. The combination with a platen and a line space wheel loose on the axle of said platen, of arms fast on said axle, a bell crank pivoted on one arm, a platen-driving spring extending from said bell crank to the other arm, a stop on said wheel limiting the throw of said bell crank by said spring, and an abutment on said wheel limiting the throw of said arm over said wheel.

7. The combination with aplaten and a line-space wheel, of connecting means between said platen and said line-space wheel, including a member fast tosaid platen, a yielding connection between said line-spaciwheel and said member to enable said line space wheel-to rotate the platen to linespace a work-sheet thereon, and adjustable means to limit the movement of said member to vary the relative positions of said platen and line-space wheel, whereby the printing line position of the platen may be changed.

8. The combination with a platen and a lever, of connecting means to enable the lever to rotate the platen to line-space a work-sheet thereon, said connecting; means including a part yiel able to permit the lever when quickly operated to move in advance of the platen, and adjustable means associated with said yielding part for reali'ning the line-spacing movements of the platen.

9. The combination with a platen and a lever, of connectingmeans to enable the lever to rotate the platen to line-space a work-sheet thereon, said connecting means including a part yieldable to permit the lever when quickly operated to move in adanemia lever to rotate the platen to lineepami a work-sheet thereon, said connecting means including a part yieldable. to permit the lever when quickly operated to move in ad- Vance of the platen, a stop for limiting the stroke of the lever, and adjustable moans independent of said stop for arresting the platen at the conclusion of its line-space movement.

11. In a typewriting machine, the corn bination with a revoluhle platen to frictionally feed a worksheet, a linespaee wheel loose on the platen axle, and a mans-- ally-operable line-space lever to rotate said wheel; of driving means coi'meoting said wheel and said platen for transmitting'the movement of the wheel to the platen and controlling the initials-peed of the platen, said driving means including a platen-driving' spring between said wheel and platen; and anadjustable device carried by said wheel to vary the relative normal positions of said wheel and platen.

1'2. In a typewriting machine, the combination with a revoluhle platen to frictionally feed a work-sheet, a line-space wheel loose on the platen axle, and a manuallyoperable line-space lever to rotate said wheel; of driving means connecting said wheel and said platen for transmitting the movement of the wheel to the platen and controlling the initial speed of the platen, said driving means including an arm fixed to said axle, a member movably mounted on said arm, a stop on said wheel bearing against said member, and a platen-driving spring connecting said member and said arm.

13. In a typewriting machine, the combination with a revoluble platen to frictionally feed a work-sheet, a line-space wheel loose on the platen axle, and a manuallyoperahle line-space lever, to rotate said wheel; of driving means connecting said wheel and said platen for transmitting the movement of the wheel to the platen and controlling the initial speed of the platen, said driving means including an arm fined to said axle, a member movably mounted on said arm, a stop on said wheel bearing against said member, a platen driving spring connecting said member and saidarm, and an ad ustable device mounted on saidswheel to vary the relative normal positions of said wheel and platen.

14. In a typewriting machine, the combination with a revoluble platen to friction ally feed a work-sheet, a line-space wheel loose on the platen axle, and a manually operable line-space lever to rotate said wheel; of driving means connecting said wheel and said platen for transmitting the movement of the wheel to the plat er. and controlling the initial speed of the platen, said driving means including an arm fixed to said aide, a mernher movnhly mounted on said arm, a stop on said wheel hearing against said member, a platen'driving spring connecting said member and said arm, and a device mounted on said wheel and a'djustably engaging said arm" ovary,

to said axle, a member movably mounted on. .said arm, a stop on said wheel bearing against said member, a platen-drivin spring connecting said member and sai arm, and a cam mounted on said wheel and adjnstably engaging said arm to vary the relative normal positions-oi said wheel and platen.

16. In a typewriting machine, the combination with a revoluble platen to frictionally feed a work-sheet, a line-space wheel loose on the platen axle, and a manuallyoperable line-space lever to rotate saidwheel of driving means connecting said wheel and said platen for transmitting the movement of the wheel to the platen and controlling the initial speed of the platen, said driving means includingnn arm fixed to said axle, a'member movably mounted on said arm, a stop on said wheel bearing against said member, a platen driving spring connecting said member and said arm, and an adjustable cam carried by said wheel to vary the relative normal positions of said Wheel and platen.

17. In a typewriting machine, the combination with a revoluble platen to friction ally feed a work-sheet, a line-space wheel loose on the platen axle, and a manuallyoperable line-space lever to rotate said wheel; oi driving means connecting said wheel and said plateii'for transmitting the V movement of the wheel to the platen and controlling the initial speed, of the platen, said driving means including an arm fixed to said axle, a bell-cranhpivoted to said arm, a stop on said wheel bearing against one arm of said hell-crank, and a platendriving spring connecting the other arm of said bell-crank and said fixed arm.

18. In a typewriting machine, the combination with a revoluble platen to frictionally feed a'work-sh'cet, a line-space wheel loose on the platen axle, and a manuallyoperahle line-space lever to rotate said Wheel; of drivingmeans connecting said Wheel and said platen for transmitting the movement of the wheel to the platen and controlling the initial speed of the platen,

said

driving means including an arm fixed said axle and extending transversely 6 thereacross, a bell-crank pivoted to one end said,a1'm,-a stop on said'wheel bearing against one arm of said bell-crank, and a P aten-di'iving spring connecting the other arm of said bell-crank and the other end of 10 said fixed arm.

nation with ally feed a 19. In a typewriting machine, the combia revoluble platen to frictionwork sheet, a line-space wh el loose on the platen axle, and a manual;

CLARENCE H. BROWN. Witnesses:

JOSEPHINE DwYEa, MABLE E. MCGRATH. 

